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Reports 'fall-through' in a <code>switch</code> statement.
<p>Fall-through occurs when a series of executable statements after a <code>case</code> label is not guaranteed
to transfer control before the next <code>case</code> label. For example, this can happen if the branch is missing a <code>break</code> statement.
In that case, control falls through to the statements after
that <code>switch</code> label, even though the <code>switch</code> expression is not equal to
  the value of the fallen-through label. While occasionally intended, this construction is confusing and is often the result of a typo.</p>
<p>
This inspection ignores any fall-through commented with a text matching the regex pattern <code>(?i)falls?\s*thro?u</code>.
</p>
<p>There is a fix that adds a <code>break</code> to the branch that can fall through to the next branch.</p>
<p>Example:</p>
<pre><code>
    switch(x) {
      case (4):
          if (condition) {
              System.out.println("3");
              // no break here
          } else {
              break;
          }
      case (6):
          System.out.println("4");
    }
</code></pre>
<p>After the quick-fix is applied:</p>
<pre><code>
    switch(x) {
        case (4):
            if (condition) {
                System.out.println("3");
            } else {
                break;
            }
            break;
        case (6):
            System.out.println("4");
    }
</code></pre>
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